[xj] trip computer

XJ
21

Thanks Scott, it worked just that way and I discovered, lo and behold, the
wiring for the prior analog clock still in the harness there. Boy, they sure
did use up inventory. I may dump the TC and put a real SII clock in, because
I hate having to turn on an ignition just to see what time it is when I’m
working on a car. The wire that’s supposed to sustain the radio’s memory was
apparently connected to the TC’s similar one and opened somewhere, so I just
bypassed it with a new wire from the radio fuse in the side panel. That fuse,
it turned out, was also playing the old Lucas rotating-fuse-cap game, so was
intermittent. I refused to go to bed before it was all fixed. We’ll be down
one of these days to pick up the stuff and check your progress on Sir Lump!–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

Scott Fraser wrote:

At 09:38 PM 6/5/02 -0700, Cannara wrote:

I need to figure out why a red wire to battery power in our 86, that appears
in the radio connector, seems to have gone open and affected the Trip Comp.
too. How does one pull out the TC?

Alex,

I have one in my hands here and each side has a set of spring steel tabs
holding it in place. It looks like a well placed pull will pop it right
out. Careful with the wood.

I still have your belts and rear panel keeping warm here.

Scott

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22

I may dump the TC and put a real SII clock in, because
I hate having to turn on an ignition just to see what time it is when I’m
working on a car.

err, Alex;

I thought news about the invention of a thing called the “wristwatch”
must have reached the US Westcoast by now?;)–
Arnoud

iMac, therefore I am

1973 Daimler Double-Six SWB
1989 Jaguar Sovereign HE
1983 XJ-S parts car

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23

At 08:07 AM 6/6/2002, you wrote:

I may dump the TC and put a real SII clock in, because
I hate having to turn on an ignition just to see what time it is when I’m
working on a car.

err, Alex;
I thought news about the invention of a thing called the “wristwatch” must
have reached the US Westcoast by now?:wink:

ROTFLMAO!!!

I think Arnoud spent enough time here in the States…he seems to have
learned the finer points of what we Americans call the “Gotcha!”.

Still chuckling,

Jeb

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24

In a message dated 6/6/02 5:09:07 AM Pacific Daylight Time, jaguar@se7en.nl
writes:

<< I thought news about the invention of a thing called the “wristwatch”
must have reached the US Westcoast by now?:wink: >>

Arnoud. Alex does not use anything that he cannot grease. :slight_smile: :slight_smile:

Bob.

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25

I hate wristwatches too!

Gave the keys to the guy at work who let me drive his Xtype yesterday and his
comments were generally good, except he thought the TC looked like something
out of the 60s, not the 80s. I reminded him that Jags of that era were meant
to be behind the times, especially given the engine was likely designed by
engineers waiting out the Blitz in bomb shelters (quoting a British lister).
:]–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

J&L Autoworks wrote:

At 08:07 AM 6/6/2002, you wrote:

I may dump the TC and put a real SII clock in, because
I hate having to turn on an ignition just to see what time it is when I’m
working on a car.

err, Alex;
I thought news about the invention of a thing called the “wristwatch” must
have reached the US Westcoast by now?:wink:

ROTFLMAO!!!

I think Arnoud spent enough time here in the States…he seems to have
learned the finer points of what we Americans call the “Gotcha!”.

Still chuckling,

Jeb

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26

the trip computer in my 84 xj6 is acting weird. when I turn the
key on after the battery has been disconnected it turns on and acts
fine and operates as usual. after a shutdown or a few the computer
will come on with random lines on it and not operate. I tried
swapping the computer and it did the same thing on the other one
only it operated fine and then everything was black. no lights.
when I unplug the computer and plug it back in it operates fine
again. any ideas? thanks
randy–
randy kassed
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27

In reply to a message from randy kassed sent Tue 9 Sep 2003:

I dont know much about the series 3’s…

However I would reccomend checking the instrument voltage
stabiliser.

Just a thought.–
The original message included these comments:

the trip computer in my 84 xj6 is acting weird. when I turn the
key on after the battery has been disconnected it turns on and acts
fine and operates as usual. after a shutdown or a few the computer
will come on with random lines on it and not operate. I tried
swapping the computer and it did the same thing on the other one
only it operated fine and then everything was black. no lights.

–
Soon to be owner of a XJ6
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28

Actually, the Ser III cars don’t have an instrument voltage stabilizer…

Doug Dwyer
Longview, Washington USAFrom: “DesertWind” dwkitsune@yahoo.com.au

I dont know much about the series 3’s…

However I would reccomend checking the instrument voltage
stabiliser.

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29

In reply to a message from randy kassed sent Tue 9 Sep 2003:

Mine does exactly the same thing. It is a bit annoying
having to disconnect the battery for a bit whenever I want
to show the car off and have everything work. Ideas,
anyone? Please?–
Tony Koschinsky '86 XJ6 Sovereign '69 TR6
Emerald Park, Saskatchewan, Canada
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30

Please try the following title in an Archive search:

T/C erratic operation & Interface Unit; was - trip computer
.
Jamie Duffey - Everett, WA
88 Series III V12 VdP - Roxanne
Jaguar Owner’s North American Tour - http://jonat.org
April 15, 2004 - July 4, 2004
.----- Original Message -----
Sent: Tuesday, September 09, 2003 8:49 AM

In reply to a message from randy kassed sent Tue 9 Sep 2003:
Mine does exactly the same thing. It is a bit annoying
having to disconnect the battery for a bit whenever I want
to show the car off and have everything work. Ideas,
anyone? Please?

Tony Koschinsky '86 XJ6 Sovereign '69 TR6
Emerald Park, Saskatchewan, Canada

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31

The following passing reference to the rivet being replaced with
a screw was in the FAQ section.’‘Once you replace the rivet with a
screw, there is a tendency for the screw head to hang on the
cutout, so a little more care will be required. Good luck!’’
Does anyone know why you would replace this rivet with a screw
and what the purpose of this rivet is for?
Robert 85 xj6–
tystick
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32

In reply to a message from tystick sent Sat 3 Jul 2004:

I can’t believe I’ve stumped the collective list on this one. I was
hoping for enlightenment.

Robert 85 & 83 xj6–
The original message included these comments:

The following passing reference to the rivet being replaced with
a screw was in the FAQ section.‘‘Once you replace the rivet with a
screw, there is a tendency for the screw head to hang on the
cutout, so a little more care will be required. Good luck!’’
Does anyone know why you would replace this rivet with a screw
and what the purpose of this rivet is for?

–
tystick
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33

Robert, I (for one) never really understood the question…although I’ll
confess that I didn’t go digging in the FAQs to see what you were talking
about. Your reference is a bit vague.

Doug Dwyer
Longview, Washington USA
1987 Ser III XJ6
1988 XJS V12From: “tystick” tyru1955@aol.com

I can’t believe I’ve stumped the collective list on this one. I was
hoping for enlightenment.

The original message included these comments:

The following passing reference to the rivet being replaced with
a screw was in the FAQ section.‘‘Once you replace the rivet with a
screw, there is a tendency for the screw head to hang on the
cutout, so a little more care will be required. Good luck!’’

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34

Robert:
The rivet is used to hold the innards of the computer to its case. The
rivet must be removed for access and if a screw is used to replace it, the
head of the screw CAN interfere with refitting the computer into the dash
again because it is a very tight fit. That is the original reference to
“hanging up”.
Gregory----- Original Message -----
From: “Doug Dwyer” dougdwyer@earthlink.net
To: xj@jag-lovers.org
Sent: Sunday, July 04, 2004 8:47 AM
Subject: Re: [xj] trip computer

: Robert, I (for one) never really understood the question…although I’ll
: confess that I didn’t go digging in the FAQs to see what you were talking
: about.

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35

In reply to a message from Dr Gregory Andrachuk sent Sun 4 Jul 2004:

Doug,
Sorry if not clear… Here is the complete excerpt from FAQ
regarding my queation:

‘‘Hunt Dabney on trip computer removal if needed
Simon Budd asked:
Does the trip computer just slide out of the dash or does it have
retaining clips somewhere?
It’s retained by a spring clip on either side (L & R). It will pry
out. Grab one end, get fingernails under bezel edge and rock/pull
on it till that sides spring clip lets go. Then do the same on the
other side. There are two molex style connectors to disconnect, and
that’s it. Once you replace the rivet with a screw, there is a
tendency for the screw head to hang on the cutout, so a little more
care will be required. Good luck!’’

Gregory,
There are screws on sides and two nuts on back that hold the
housing to the innards. The pop rivet seems to have another
purpose…be a ground of sorts as it touches a small metal angle
plate inside. It had green corrosion when I first removed the cover
(indictating a current or draw)thru it. I am thinking that although
the FAQ section refers to the screw hanging up when removing unit
from dash, it does not address why you would want to replace the
rivet with a screw.

It is refered to as if it is a necessary mod. for some reason
although I cannot find any other reference to it.
I believe the rivet needs to make contact with the plate for ?
If loose a screw would be necessary toi complete computer circuit?

Robert 85 & 83 xj6–
The original message included these comments:

The rivet is used to hold the innards of the computer to its case. The

rivet must be removed for access and if a screw is used to replace it, the
head of the screw CAN interfere with refitting the computer into the dash
again because it is a very tight fit. That is the original reference to
‘‘hanging up’’.

–
tystick
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36

OK: I have no clue what it is for. But I think the reference to its “hanging
up” is to refitting the computer in the dash without damaging the wood.
Gregory----- Original Message -----
From: “tystick” tyru1955@aol.com
To: xj@jag-lovers.org
Sent: Sunday, July 04, 2004 10:54 AM
Subject: Re: [xj] trip computer

: In reply to a message from Dr Gregory Andrachuk sent Sun 4 Jul 2004:
:
: Doug,
: Sorry if not clear… Here is the complete excerpt from FAQ
: regarding my queation:
:
: ‘‘Hunt Dabney on trip computer removal if needed
: Simon Budd asked:
: Does the trip computer just slide out of the dash or does it have
: retaining clips somewhere?
: It’s retained by a spring clip on either side (L & R). It will pry
: out. Grab one end, get fingernails under bezel edge and rock/pull
: on it till that sides spring clip lets go. Then do the same on the
: other side. There are two molex style connectors to disconnect, and
: that’s it. Once you replace the rivet with a screw, there is a
: tendency for the screw head to hang on the cutout, so a little more
: care will be required. Good luck!’’
: : It is refered to as if it is a necessary mod. for some reason
: although I cannot find any other reference to it.
: I believe the rivet needs to make contact with the plate for ?
: If loose a screw would be necessary toi complete computer circuit?
:
: Robert 85 & 83 xj6
:

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37

In reply to a message from Dr Gregory Andrachuk sent Sun 4 Jul 2004:

I was able to extract this from 1997 archvies which answers my
question:

Simon-
You can probably clean the switches, or replace them. I’ve opened
my trip computer to repair it. Opening it is a little tricky, as
the voltage regulator is riveted to a bracket through the case. The
case also screws to the front panel. The rivet head must be ground
off, the screws removed, then the cover will come off. The remnants
of the rivet must be located and removed from the works. I used a
pal nut on the internal piece (folded over spring steel with
threads formed in it) to allow a screw to replace the rivet. As
there is a clearence problem with a screw head, a button head
allen or similiar low profile screw is needed.
This will at least let you take a look and put it all back together.
Good luck!
Hunt–
tystick
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38

Does anyone know why you would replace this rivet with a screw
and what the purpose of this rivet is for?

Missed the original question. The rivet is vital since it secures the
heatsink tab of the computer’s power regulator to the case which then acts
as a large heatsink. If the tab is not very snug to the case the regulator
will overheat and pop. It’s a horrible bit of production engineering, but
perhaps they thought one would never need to open the case. Best to replace
the rivet (if you’ve removed it to get inside the case) with another 3mm
pop rivet (DIY blind rivet), then it wont foul the dash. I don’t see how a
scree could work since you can’t hold the nut inside the case! A
self-tapping screw would be awful since it would put a lot of strain on the
power regulator (a relatively flimsy semiconductor device) possibly
wrenching out its connections to the printed circuit board. Ugh!

Chris

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39

In reply to a message from Chris Knowles sent Mon 5 Jul 2004:

I have a feeling that this could possible be why I have to unplug
the connectors to reset the computer on a regular basis.
It seems to work fine for awhile yet always goes haywire. After
resetting, it works fine again. Maybe it is the heat sink not
transferring enough heat thru rivet to body?
Robert–
The original message included these comments:

Missed the original question. The rivet is vital since it secures the
heatsink tab of the computer’s power regulator to the case which then acts
as a large heatsink. If the tab is not very snug to the case the regulator

–
tystick
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40

In reply to a message from Chris Knowles sent Mon 5 Jul 2004:

Uh Oh! I have a trip computer that I disassembled to clean the
green plastic lens that someone had clouded with acetone or some
such, and I don’t remember this rivet. Now I have to remember
which car and take it out again to check. Hope I still have the
photos I took to tell me which one it was. So much for a relaxing
holiday today…but…thanks for the tip, list–
The original message included these comments:

Missed the original question. The rivet is vital since it secures the
heatsink tab of the computer’s power regulator to the case which then acts
as a large heatsink. If the tab is not very snug to the case the regulator
will overheat and pop. It’s a horrible bit of production engineering, but
Chris
www.kwejaguar.co.uk

–
Phil in Northwest Arkansas
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